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//    public static void main(String[] args) {
//        System.out.println("Hello world!");
//    }
//}

public class Main {
    public static void main(String[] args) {
        F(5);
    }
    public static int[][] F(int n){
        int[][] array = new int[n][];
        int count = 0;
        for(int i = 0; i < n; i++) {
            array[i] = new int[n-i];
            n--;
            count++;
        }
        System.out.println(count);
        return array;
    }

}